Hi there....My first post and my first older non turbo diesel. I'm hoping you experienced guys can set me straight. When I'm driving on the hwy at 65+ mph and I give it throttle, the truck feels like it up shifts. RPM's go down instead of up. When I let off the throttle, the rpms go back up. So it just feels like its driving at too high an rpm and it also seems to be burning a ton more fuel than when I first bought it. It just bounces back and forth in the rev range while at these speeds and its driving me nuts!

I replaced the TPS already. All I can think of now is maybe the converter but I'm not 100% on how they work? Has anybody else had this problem? Truck only has 62k miles. Also, the ABS light is always on. Local mechanic says the abs goes through a speed module or something and could have something to do with it, but I think if that light wasn't on he would never had said this. Though there seem to be a lot of oddities with these trucks, so who knows. I'm just trying to get this thing to be my dead reliable work truck for years to come and hopefully a decent fuel sipper.

Thanks for reading. Any help would be much appreciated.
Jay